iPhone/iPad Calendar Subscription

Enter or copy in the server address listed here:
webmail://[insertyourtravelteam].riversidebaseball.com/team-events/?ical=1&year-feed=1
and replace the travel team name. (eg. webcal://bantamminor.riversidebaseball.com/team-events/?ical=1&year-feed=1 )

Add a Description like Bantam Minor Calendar for easy viewing.

You do not have to enter any other fields.

Tap the Next button.

Tap the Save button.

Google Calendar Subscription

Source
Note: You can only add a calendar using a link from a computer, not the app.

Open Google Calendar in your web browser.

Next to Other Calendars in the sidebar on the left, click the Down Arrow just right of the title.

Select Add by URL.

Enter the calendar’s address in the field provided. The address looks like this:
webmail://[insertyourtravelteam].riversidebaseball.com/team-events/?ical=1&year-feed=1
Don’t forget to replace the travel team name. (eg. webcal://peeweemix.riversidebaseball.com/team-events/?ical=1&year-feed=1 )

Click Add Calendar. The calendar will appear on the left side under the Other Calendars.